R/S Plus Soft Solids Tester
SSTB version with pin spindle for viscosity display in BU
New, enhanced encoder allows for increased measuring and control capabilities while maintaining sophisticated rheological analysis at an affordable price.
Product Description
- Features & Benefits
- Principle of Operation
- Spindle Ranges
- Download Brochure
- Annual Calibration Service (recommended)
The R/S Plus Soft Solids Tester is a controlled rate/controlled stress rotational rheometer featuring vane spindles designed to measure "lumpy" or viscoelastic materials and is ideal for characterizing gels, pastes and slurries because of its ability to preserve sample structure with the use of vane spindles. Controlled stress tests provide important information on startup flow behavior (viscoelasticity, yield stress and creep).
Features & Benefits
- Vane spindle geometry allows spindle insertion without compromising sample structure
- Easy-to-test method for materials with particulates, slurries, and stiff pastes
- Provides data that relates to viscoelastic characteristics such as yield stress, shear modulus (stiffness of material structure when intact) and creep
- Quantifies meaningful properties like wobbliness, sloppiness, consistency and texture
- Automated data analysis under PC control
- Rugged design for years of trouble-free operation in QC and R&D applications
- Can also be used with coaxial cylinders for flow curve analysis
- Optional Rheo3000 software with Soft Solids Module allows you to program the R/S Plus Soft Solids Tester and generate data such as yield point, shear modulus, creep and relaxation
Principle of Operation
The flow properties of these materials are not easily measured using traditional coaxial cylinder or cone & plate equipment. Vane spindle geometry provides a solution. The vane spindle is lowered into the test sample with minimal disruption. The test is easily run in the sample's original container.
There are two significant Test Methods easily accomplished by the Soft Solids Tester:
- Constant Rate Yield Test
- For Products Like
- Stiff pastes, slurries, set gels, waxes
- Properties Measured
- Yield Stress, Yield Strain, Modulus
- Test Description
- This is a Constant Shear Rate Test. The vane is rotated at a constant low rotational rate and the Stress (torque) is measured against Time, Rotational Angle or Strain.
- Example Method for Mayonnaise
- Constant Rotation at 0.2 rpm, 60 data points are taken in 60 seconds
- Typical Results Plot
- The Creep/Recovery Test
- For Products Like
- Gels, lumpy products like custard, gravy, sauces and jams
- Properties Measured
- Instantaneous Strain, Viscous Creep, Elastic Recovery, Permanent Flow
- Test Description
- This is a Constant Stress Test. The Stress (torque) is applied to the sample for a fixed time period, usually from one to five minutes. The degree of sample movement is recorded against time as Angular Displacement, Strain or Compliance. The Stress is removed and the Elastic Recovery and Permanent Flow is determined.
- Example Method for Fruit Preserves
- Constant Stress of 1,250 Pa is applied over 120 seconds and 60 data points are taken. The stress is then removed and 60 data points are taken for another 120 seconds.
- Typical Results Plot
Consult with Brookfield to determine if the Soft Solids Tester with Vane Spindle Geometry is a suitable solution to your testing needs.
Spindle Ranges
